dhcpcd/src/if-options.c:2133 Heap Buffer Overflow in parse_option

[sigdevel]

dhcpcd/src/if-options.c:2133 Heap Buffer Overflow in parse_option

Description:

When dhcpcd parses a crafted configuration file, it may perform an out-of-bounds heap write in "parse_option()" (src/if-options.c:2133).
The supplied config contains truncated option lines, but instead of safely rejecting the line, dhcpcd probably reaches a memcpy in "parse_option()" and writes 143 bytes past the end of a 72-byte heap allocation, triggering an heap-buffer-overflow and abort

Output:

asan-build:

show full -click to expand

unknown option: i�
unknown option: no
unknown option: leasetivsio6
unknown option: broadcare
unknown option: noi1ic
unknown option: statid
authtoken requires a realm
unknown option: stati^
static assignment required
unknown option: q3AAAAcAAAAAtati�
static assignment required
unknown option: nop1
unknown option: s
unknown option: sta`ic
=================================================================
==27115==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x507000001aa8 at pc 0x5595636fe0d2 bp 0x7fff17aecb90 sp 0x7fff17aec350
WRITE of size 143 at 0x507000001aa8 thread T0                                                                                                              
    #0 0x5595636fe0d1 in __asan_memcpy (/media/user/8ed8205b-4114-4c2a-b2d0-e2ad6640262d/dhcpcd/dhcpcd_asan/src/dhcpcd+0xe50d1) (BuildId: a2cd647b862a0905857412ad54c9950619ec029b)
    #1 0x55956378775e in parse_option /media/user/8ed8205b-4114-4c2a-b2d0-e2ad6640262d/dhcpcd/dhcpcd_asan/src/if-options.c:2133:4
    #2 0x5595637735d3 in parse_config_line /media/user/8ed8205b-4114-4c2a-b2d0-e2ad6640262d/dhcpcd/dhcpcd_asan/src/if-options.c:2605:10
    #3 0x5595637735d3 in read_config /media/user/8ed8205b-4114-4c2a-b2d0-e2ad6640262d/dhcpcd/dhcpcd_asan/src/if-options.c:2940:3
    #4 0x55956375654a in main /media/user/8ed8205b-4114-4c2a-b2d0-e2ad6640262d/dhcpcd/dhcpcd_asan/src/dhcpcd.c:2191:8
    #5 0x7f1197844ca7 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
    #6 0x7f1197844d64 in __libc_start_main csu/../csu/libc-start.c:360:3
    #7 0x559563660880 in _start (/media/user/8ed8205b-4114-4c2a-b2d0-e2ad6640262d/dhcpcd/dhcpcd_asan/src/dhcpcd+0x47880) (BuildId: a2cd647b862a0905857412ad54c9950619ec029b)

0x507000001aa8 is located 0 bytes after 72-byte region [0x507000001a60,0x507000001aa8)
allocated by thread T0 here:                                                                                                                               
    #0 0x559563700970 in reallocarray (/media/user/8ed8205b-4114-4c2a-b2d0-e2ad6640262d/dhcpcd/dhcpcd_asan/src/dhcpcd+0xe7970) (BuildId: a2cd647b862a0905857412ad54c9950619ec029b)
    #1 0x55956378758e in parse_option /media/user/8ed8205b-4114-4c2a-b2d0-e2ad6640262d/dhcpcd/dhcpcd_asan/src/if-options.c:2113:11
    #2 0x5595637735d3 in parse_config_line /media/user/8ed8205b-4114-4c2a-b2d0-e2ad6640262d/dhcpcd/dhcpcd_asan/src/if-options.c:2605:10
    #3 0x5595637735d3 in read_config /media/user/8ed8205b-4114-4c2a-b2d0-e2ad6640262d/dhcpcd/dhcpcd_asan/src/if-options.c:2940:3
    #4 0x55956375654a in main /media/user/8ed8205b-4114-4c2a-b2d0-e2ad6640262d/dhcpcd/dhcpcd_asan/src/dhcpcd.c:2191:8
    #5 0x7f1197844ca7 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16

SUMMARY: AddressSanitizer: heap-buffer-overflow (/media/user/8ed8205b-4114-4c2a-b2d0-e2ad6640262d/dhcpcd/dhcpcd_asan/src/dhcpcd+0xe50d1) (BuildId: a2cd647b862a0905857412ad54c9950619ec029b) in __asan_memcpy
Shadow bytes around the buggy address:
  0x507000001800: fd fa fa fa fa fa fd fd fd fd fd fd fd fd fd fa
  0x507000001880: fa fa fa fa fd fd fd fd fd fd fd fd fd fa fa fa
  0x507000001900: fa fa fd fd fd fd fd fd fd fd fd fa fa fa fa fa
  0x507000001980: fd fd fd fd fd fd fd fd fd fa fa fa fa fa fd fd
  0x507000001a00: fd fd fd fd fd fd fd fa fa fa fa fa 00 00 00 00
=>0x507000001a80: 00 00 00 00 00[fa]fa fa fa fa fa fa fa fa fa fa
  0x507000001b00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x507000001b80: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x507000001c00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x507000001c80: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x507000001d00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==27115==ABORTING

Environment

OS: tested at 6.12.25-1kali1 (2025-04-30) x86_64 GNU/Linux ;
Compiler version: Clang 19.1.7 ;
Build-opts: -g -O1 -fno-omit-frame-pointer -fsanitize=address,undefined ;
CPU type: x86_64 ;
dhcpcd - commit hash 117742d755b591764036dd4218f314f748a3d2b7 ;

Additional context

link to the sample (github-url):

if-options_c_2133

Screenshots

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---

🔗 Similar Issues

Related Issues

• dhcpcd/src/if-options.c:1886 NULL Pointer Dereference in parse_option #567
• dhcpcd/src/route.c:338 SEGV by a READ memory access in rt_headclear #571
• dhcp_envoption 24.0/3: missing embedded option #527
• dhcpcd program crash in case flooded with ICMPv6 RAs (Router Advertisements) #515
• 10.4.2 now reports 'malformed embedded option' from router #508
• SIGSYS with custom allocators #497

🔗 Related PRs

#568 - options: Ensure ldop is not NULL dereferenced [merged]

👤 Suggested Assignees

• sigdevel
• toralf
• Sime-Zupanovic
• TheEpeeist
• perkelix

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[rsmarples]

Pretty sure this is fixed with the above.

[sigdevel]

Pretty sure this is fixed with the above.

Fixed, thank you

trace:

show full -click to expand

==702288==Registered root region at 0x7f6c10401e80 of size 128
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c10401e80 of size 128
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept '__isoc99_printf'
==702288==Registered root region at 0x7f6c10401e80 of size 128
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c10401e80 of size 128
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept '__isoc99_sprintf'
==702288==Registered root region at 0x7f6c10401e80 of size 128
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c10401e80 of size 128
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept '__isoc99_snprintf'
==702288==Registered root region at 0x7f6c10401e80 of size 128
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c10401e80 of size 128
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept '__isoc99_fprintf'
==702288==Registered root region at 0x7f6c10401e80 of size 128
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c10401e80 of size 128
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept '__isoc99_vprintf'
==702288==Registered root region at 0x7f6c10401e80 of size 128
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c10401e80 of size 128
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept '__isoc99_vsprintf'
==702288==Registered root region at 0x7f6c10401e80 of size 128
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c10401e80 of size 128
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept '__isoc99_vsnprintf'
==702288==Registered root region at 0x7f6c10401e80 of size 128
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c10401e80 of size 128
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept '__isoc99_vfprintf'
==702288==Registered root region at 0x7f6c10401e80 of size 128
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c10401e80 of size 128
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'pthread_mutexattr_getrobust_np'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdrmem_create'
==702288==Registered root region at 0x7f6c10401e80 of size 128
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c10401e80 of size 128
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdrstdio_create'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_short'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_u_short'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_int'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_u_int'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_long'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_u_long'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_hyper'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_u_hyper'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_longlong_t'
==702288==Registered root region at 0x7f6c10401e80 of size 128
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c10401e80 of size 128
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_u_longlong_t'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_int8_t'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_uint8_t'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_int16_t'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_uint16_t'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_int32_t'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_uint32_t'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_int64_t'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_uint64_t'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_quad_t'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_u_quad_t'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_bool'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_enum'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_char'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_u_char'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_float'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_double'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_bytes'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_string'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdrrec_create'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept 'xdr_destroy'
==702288==Registered root region at 0x7f6c0fe01ab0 of size 112
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fe01ab0 of size 112
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept '__cxa_throw'
==702288==Registered root region at 0x7f6c0fc02250 of size 144
==702288==Registered root region at 0x7f6c100007a0 of size 32
==702288==Unregistered root region at 0x7f6c0fc02250 of size 144
==702288==Unregistered root region at 0x7f6c100007a0 of size 32
==702288==AddressSanitizer: failed to intercept '__cxa_rethrow_primary_exception'
==702288==AddressSanitizer: libc interceptors initialized
|| `[0x10007fff8000, 0x7fffffffffff]` || HighMem    ||
|| `[0x02008fff7000, 0x10007fff7fff]` || HighShadow ||
|| `[0x00008fff7000, 0x02008fff6fff]` || ShadowGap  ||
|| `[0x00007fff8000, 0x00008fff6fff]` || LowShadow  ||
|| `[0x000000000000, 0x00007fff7fff]` || LowMem     ||
MemToShadow(shadow): 0x00008fff7000 0x000091ff6dff 0x004091ff6e00 0x02008fff6fff
redzone=16
max_redzone=2048
quarantine_size_mb=256M
thread_local_quarantine_size_kb=1024K
malloc_context_size=30
SHADOW_SCALE: 3
SHADOW_GRANULARITY: 8
SHADOW_OFFSET: 0x00007fff8000
==702288==Installed the sigaction for signal 7
==702288==Installed the sigaction for signal 8
==702288==T0: FakeStack created: 0x7f6c0e8f7000 -- 0x7f6c0f400000 stack_size_log: 20; mmapped 11300K, noreserve=0 
==702288==T0: stack [0x7ffe17213000,0x7ffe17a13000) size 0x800000; local=0x7ffe17a0fde4
==702288==AddressSanitizer Init done
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unknown option: no
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unknown option: broadcare
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unknown option: statid
authtoken requires a realm
unknown option: stati^
static assignment required
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static assignment required
unknown option: nop1
unknown option: s
unknown option: sta`ic
bitflag string too long ===================D============================================================================================?==================�diiure
      noi1
unknown option: noi1
unknown option: s
static assignment required
unknown option: ar�ing
unknown option: anon
main: mkdir: /var/db/dhcpcd: No such file or directory
main: mkdir: /var/run/dhcpcd: Permission denied
main: pidfile_lock: /var/run/dhcpcd/pid: No such file or directory